I highly recommend Terachai's place. He is a great host, so nice and friendly. The house is beautiful, clean, fully furnished and close to public transit. You can walk to Sukhumvit MRT and Asok BTS in few minutes. It's also near Terminal 21, a big shopping mall where you can find many famous fashion brands and restaurants. For those who love massage, you can go to Massage.Le, just 4-500m from this place. They really have good massage therapists. You can enjoy a relax foot massage after walking all day.